（）is the study of second and foreign language teaching and learning.
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1、（） is the control of temperature and h
（） is the control of temperature and humidity in a space together with the circulation, filtering and refreshing of the air.ARefrigerationBAir conditioningCVentilationDHeating
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2、If the length of a wire is halved and
If the length of a wire is halved and the cross-sectional area is doubled, the resistance will be （）AquarteredBunchangedCdoubledDquadrupled
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3、Swell is the rise and fall of the ocea
Swell is the rise and fall of the ocean’s surface due to（）.AfetchBdistant windsClocal stormsDthe pull of the moo
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4、Sociolinguistics is the study of langu
Sociolinguistics is the study of language in relation to society.A正确B错误
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5、Linguistics is the study of language a
Linguistics is the study of language as a system of human （）.
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6、is the sending and receiving of the me
is the sending and receiving of the messages by computer. It is a fast, low-cost way of communicating worldwidE..ALANBPost officeCE-MailDInterface